Charoensuk, Jarruwat

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Charoensuk, Jarruwat
Alternative Name
Charoensuk, J.
Charoensuk, Jaruwat
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Email
jarruwat.ch@kmitl.ac.th

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    All parts overall heat transfer coefficients in correlation with design and off-design load conditions in a utility bagasse boiler
    (2025-01-15)
    Charoensuk, Jarruwat
    ;
    Lapirattanakun, Arwut
    ;
    Laphirattanakul, Ponepen
    Overall heat transfer coefficients of the four major sections in the 73 MW bagasse-fired boiler used in sugar industry were analyzed in correlation with the operating conditions. Comprehensive measurements were provided at different operating conditions including at design and off-design in relation to load generation and combustion performance on the firing grate. At the design condition, the overall heat transfer coefficients across the different sections, namely, the furnace, superheater, back tube and bank tube zones, were found uniformly within the range of 60–80 W/m<sup>2</sup>-K. Maintaining the overall heat transfer coefficient within this narrow range ensures that each section of the boiler is contributing optimally to the overall thermal efficiency. The optimal range of heat transfer coefficient in the furnace zone is within the range of 66–72 W/m<sup>2</sup>-K with 90 % of heat transfer in this zone occurring through radiation. While the high convection resulting from a high flue gas flow rate during off-designed condition leads to insufficient heat transfer in the furnace zone. Approximately 60 % of the heat uptake is instead absorbed by the bank tube section, which is strategically designed to capture the bypassed heat from the preceding section. It was also found that the overall radiative factor providing efficient heat transfer ranged from 0.48 to 0.63.
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    Developement of porous media burner operating on waste vegetable oil
    (2017-01-05)
    Lapirattanakun, Arwut
    ;
    Charoensuk, Jarruwat
    A newly designed cooking stove using Wasted Vegetable Oil (WVO) as fuel was introduced. Porous media, containing 2 cm diameter of spherical ceramic balls, was used as a flame stabilizer. Steam was successfully applied in a burner at this scale to atomize WVO droplet and entrain air into the combustion zone as well as to reduce soot and CO emission. DIN EN 203-1 testing standard was adopted and the experiment was conducted at various firing rate with the water flow rate at 0.16, 0.20 and 0.22 kg/min. Temperature, emissions, visible flame length, thermal efficiency as well as combustion efficiency were evaluated. Under the current WVOB design, it was suitable to operate the burner at the range of nominal firing rate between 325 and 548 kW/m<sup>2</sup> with water flow rate of 0.16 kg/min, at burner height to diameter ratio of 0.75, giving CO and NO<inf>x</inf> emissions up to 171 and 40 ppm, respectively (at 6% O<inf>2</inf>). Thermal efficiency was at around 28% where the combustion efficiency was approximately at 99.5%. The performance of WVO burner could be improved further if increasing the H/D ratio to 1.5, yielding thermal efficiency up to 42%.
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    On flame stability, temperature distribution and burnout of air-staged porous media combustor firing LPG with different porosity and excess air
    (2011-11-01)
    Charoensuk, Jarruwat
    ;
    Lapirattanakun, Arwut
    A porous combustor burning partially premixed LPG with staged air is investigated prior to be used as a prime heat source in a hydrogen production unit of Solid Oxide Fuel Cell System. It has 325 mm in height with 100 mm of inside diameter. The small amount of air is mixed with liquid petroleum gas at the bottom of the combustor and the rest is staged at 0 and 100 mm next to the distributor plate. Thermal throughput is kept at 3 kW with the excess air ranging from 110% to 180%. Temperature distributions are investigated for three values of porosity and linked with Peclet number, convection and turbulent mixing of hot product and unburned reactant. Experimental data suggested that it is reasonable to use Peclet number calculated using the flame speed of propane to determine the combustion stability. Low and well-distributed temperature profile is achieved. The apparatus meets the design criteria with staged air but caution must be made to avoid over-staging. An important operation criterion is found in the mixture preheating zone; the temperature level within the distance of 100 mm. from the distributor plate must be higher than 800 °c for a sufficient level temperature throughout the burner domain. © 2011 Elsevier Ltd.